Method of manufacturing tubular bags, envelopes, and like containers with folded ends



J. W. D OF MANUFACTURING TUBUL March 13, 1956 RANDALL 2,737,860 METHO AR BAGS, ENVELOPES AND LIKE CONTAINERS WITH FOLDED ENDS 52 2 Sheets-Sheet 1 Filed July 2) l9 .lllllll 2,73 7,860 BAGS, ENv ELoPEs March 13, 1956 J. w. RANDALL METHOD OF MANUFACTURING TUBULAR AND LIKE CONTAINERS WITH FOLDED END 2 Sheets-Sheet 2 Filed July 2, 1952 ig- D United States Patent METHOD OF MANUFACTURING TUBULAR BAGS, N E PE- AND L KE CQNTAINERS T FOLDED ENDS John William Randall, Green End, Boxmoor, Hemel Hempstead, England, assignor to John Diekinson & Co. Limited, Hemel Hempstead, England, a British omp ny Appl t on J ty .952 S ti N 2 79 Claims priority, application Great Britain July 3, 1951 .0 C i s- (Cl. 93- 8 h Ptee h inven io re ates to h the eiet re of bags, envelopes and like containers, hereinafter referred o. s ee fr m p p ee h e e n he e ib e shee materials suitable for the purpose, and is applicable with considerable advantage, although not restricted, to the eh te h e o bass fr h eh e mo e h s ti h t h r eoh hhe b o be -me t m rie s ohh y d ng o r on n o a h s tub o suit ble th n e u in he ih o eti t ee h h fold to the exter al wall of one side of the bag tube and t e hi he p se ee o t e fol to et er (when two 'hiet hott h e i e ett ed). ar set steototy h h fo man purpo s b re t p o ly Pow et- P Q f h y t h le Powd hi li e .sohs h s end o eth e h eh l een the bo om to o s e ho s h t i le l a th eo he s oi" ee t' he ho ds h s t h th o he t and even ually h h the ees in et d ti h o i ehth the t hi- In th r o overcome the a e t htiohe i hisesivehhe i the te h b s w h dou le told. hott th produced by forming a bag tube from e web of material d en t -iee toh ihe e th bottom eht of e tub ee. e e h s et th 'ettoht it hes pr vi u ly eeh. Pto- P se to a ly tr h v tse s ip s of adhesive to the ihhe e of h we p r to thi h he has thhe therefrom! s h t he ihte el W ls lot e ehth htet the length severed from the bag tube lorrned from the web a ited y e h t s p f adhesi e e teht h he the en i h het t et he lat ihtehded to be ome he ed ttohi o t es e d the o. e hly two tr e f dh to t e h et l ell ot one title o the se h h et has e th in th te ioh ot the: otm ehtt tel h t tt ih. o he o ecure the o m fo h h mode; to h ex ernal well o he bee i e h t o h ot er- Theprimary object of this inver tio to pgovigle a i d and pr e metho of p ooheih t t h h i he et t t tom end olds ehd a othe 9, 'ee of the invention is to produce modified and imp forms of tubular bags with powderproofv bott fold area so that when the bag tube is formed by t dih he teh t't h l ei hts ot he'h k ihwert 's o er h e e pert het o t the h thet Well ot' he themes bag tube are united and sealed bythe' adheeive in. its

o d; ete e te h eh te Wi th thet ot; whit te'h t f e t th h eh e ih st e is exposed t o h an hl h formed W t e t wey tha i the portiohs of the bag blank so as to secure the inturried face of the transverse bottom end fold or first such' trans- "ice verse end fold to a Wall of the bag tube and seal the bottom end fold so formed to close the bottom end of the bag tube.

If the bag formed as above described is to be provided with a second bottom end fold or two or mere subsequent bottom end folds, at least one additional stripe of adhesive will be applied to the external wall oi one Sid of the bag tube in the bottom end fold area theregfz, prior to e h l' h h s b t m en f l or sh s q ieh bottom end folds in order to secure the said seeo b q ent h h n made o the ee th Al t i y r i esi l ioh to t u o the tes tiehed n lly ap lied stri o ttio sot adh e a tt or st s o d esive t ey be ent t es t eh l t e o fe s o thee or ot'the stih formed tt m h i tol s in order t secure the old o l o h ide f th h s tohee h t o this n nt n i equa eeh'lieeh t t e manut e e o Pla o at be s w h s n e tote o thhlti-foltl. om d sset-sided e ehe a s with Single fold, t th t -to ot oths and lends itse wit o r e d e e to the t ohe ioh o eith r ho o se l begs th s ellop d mou Both fl t t e el be s to hee l hy the m thod o this invention r hti et P'owd t to the rea t t bottom f t e. e tithe he'h 1 t ,s corners or eats th teottete eothhlet l ej e eh he.- o t bottom d dih is etteoteti ht t, tom end o h h hh s i hthe ex os d not oh or the eth j y ap l e et hesi e to fo th. h'se 'ehd seal ispo ed to the outer side of the seal formed by adh h/unit:- ing the internal walls of the bag tube, V

M f eerryihg th hiet odo ih eh i h into effect, mo ie le t as a pl ed to the Ptotht tieh o gusset o ed se he ba s it dou folded h ttoin froth e e h h het me hihe-h de hes tube w ll hereinafter e t t h de ibed, by hy 0t e th le hd th u mp e limi tion o the seehe. o the thvention, with reference to the accqmpahyi ig P143313 d grammatic drawings in which:

" Fi 1 sh n p Pleh iew th eh e lssive st ge of fdrming a web of paper or other suitable bag-making material into a continuous bag tube with longitudinal g s ds and y ottom end told. at es ehd o te f e u l g en t het tt hi tot the pro oh' of tubular s i e o t h e w th the in eh ohj;

Figs- 2- are p l h i f e hh le 23519 181 8, tirewh o e larger s t le sho ih t e w ees iv e i t o g a gusset id setehel ee ot v e femintion witha double fold subetantially powde 'progf bot.- tom;

F g e g a l x g ted f a mentar cros seetiohel views o the h ttoh e d to d ete s and folds t h tubular s le g shown in Fi s-t -5 stee estively; i

Fig. 10 is a fragmentary top plan view, drawn tea larger scale, to show in detail the disposition of the transverse adhesive stripes applied to the lgqttgni end d area f th t lar has, l n th;

ig, 11 is a at y xa e ated fh' e heh lht'v ross sectional view of the bottom end fold area of a tubular eg ng h h ng he relative dispo t n oi he inter a ily di p e a h sive s i es an tr ve seiho to h end o n e the has l h. i he. ol sed. by one bottom end fold line only; i I

12 is a cross ti n l i ws milet to. F re-1 .1 but n h ing om end o d t t ne o ose the ot h f bule: bo en h;

13 is tar t p Pla iew sh n on alternative disposition of the transverse adhesive stripe for securing the second bottom end fold to the bag tithe and sealing it.

Figs. 14 and 15 are fragmentary top plan views, drawn to a larger scale, showing alternative relative positions of the transverse adhesive stripes and fold line of the first bottom end fold in the bottom end fold area of the tubular bag length, and

Fig. 16 is a corresponding fragmentary view showing the first transverse bottom end fold formed.

Figure 17 is an enlarged sectional view on line 17fl7 of Figure 1.

Figure 18 is an enlarged sectional view on line 1s-1s of Figure 1.

Referring to Fig. l of the accompanying drawings, a web 1 of paper or other suitable bag-making material may be fed from a supply reel to gusset-fold forming and bag forming means of any suitable form of tubular bag making machine. In travelling from the first gusset-fold forming means, the web 1 receives adhesive from a first adhesive-applying station having means for applying the usual longitudinal seaming stripes of adhesive 2 to the inner face of one longitudinal margin of the web and means for applying at least two narrow transverse stripes of adhesive 3, 3a to the inner surface of the web, the length of each transverse stripe being equal to the full width of the fiat folded bag tube subsequently produced from the web plus the combined depths of the longitudinal gusset folds produced in forming the bag tube from the web. Alternatively, the transverse adhesive stripes 3, 3a may extend across the entire width of the unfolded web.

Again alternatively, the area bounded by each pair of transverse adhesive stripes 3, 3a may be covered by a single wider stripe or patch of adhesive.

Each pair of adhesive stripes 3, 3a, or wider adhesive stripe or patch is disposed in the bottom end fold area of a tubular bag length subsequently to be severed from the formed bag tube.

The adhesive-treated web is then engaged in the first gusset fold means which serve to tuck in the longitudinal marginal portions of the web to form the first gusset folds 4 therein. After the first gusset folds 4 are made, portions are removed from each longitudinal margin 9 of the web to provide slots or notches 5 oppositely aligned and extending inwards almost to the depth of the first gusset folds 4 and disposed so as to extend to each side of the transverse lines 6 along which the tubular bag lengths 7 are subsequently severed from the continuously formed bag tube 8.

The web may thereafter be engaged in final gussetfold and tube forming sections or means which complete the second gusset folds 4a and infold the longitudinal margins or flaps 9 of the web into overlapping relation for securing together by the previously applied seaming stripes of adhesive 2, thereby forming the bag tube 8. In this tube-forming operation, the inner faces of the infolded longitudinal margins or flaps 9 are united to inner faces of the gusset folds, 4, 4a, and the central part of the web 1 by the stripe 3 of each pair of transverse stripes of adhesive (or a part of each wider stripe or patch of adhesive) previously applied to the inner face of the web. At the same time, the oppositely aligned slots or notches 5 are brought together with the open ends thereof in register to form elongated e. g. substantially oval slot-like openings through which some part of the other stripe 3a of each pair of transverse adhesive stripes ('or some part of each single wider stripe or patch of adhesive) is exposed.

The bag tube 8 thus formed is then severed along the transverse severing lines 6 intersecting the adhesive-exposing slot-like openings it formed by the said notches or slots 5. As shown in Fig. 2, each tubular bag length 7 severed from the continuous bag tube 3 has one end thereof, i. e. the bag mouth end bm, entirely clear of transversely applied adhesive while one of the month end edges is cut away or scalloped. The other end of the bag length 7, i. e. the bottom fold end bb, has the inner 'walls of its sides secured together and sealed by the internally applied transversely extending stripes of adhesive 3 and the bottom fold end of that one of the said sides formed by the longitudinal fold flaps 9 is cut away or scalloped to expose the internally applied adhesive stripe 3a, as also shown in Fig. 6.

The tubular bag length 7 is then progressed to bottom end fold forming means and the first bottom end fold 11 made, thus bringing the inturned face of the bottom fold and exposed part of the internally disposed adhesive stripe 3a into contact with the external bag wall formed by the infolded marginal portions 9. The bottom end fold 11 is secured by the adhesive to the side of the bag tube, whilst the adhesive forms a second seal between the external wall of the bag tube and those parts of the second formed gusset folds 4a and internal wall of the opposite side of the bag tube which are exposed through the opening formed in the first mentioned side of the bag tube. Thus, the bag B as shown in Figs. 3 and 7 is produced.

In the further alternative arrangements shown in Figs. 14, 15 and 16, the slot-like openings 10 are widened so that one of the sides of the bottom fold end bb of the severed bag length 7 is cut away or scalloped to a considerable depth, thereby to enable the first bottom end fold 11 to be formed by transversely folding the scalloped bottom end part upon itself about the fold line 15. When the fold line of the first bottom end fold is thus disposed, the transverse stripe of adhesive 3a which is exposed by the cut away or scalloped bag tube end, may be set to one side of the fold line so as to be contained in that part of the bottom end fold area of the bag tube which is covered by the folded over bottom end fold 11, as shown in Fig. 14, or may be disposed to the opposite side of the fold line 15 so as to be contained in the area of that part of the bag tube which is folded over to form the bottom end fold 11. In either case, as shown in Fig. 16, the adhesive stripe 3a will act to secure the inner face of the bottom end fold 111 to the internal wall of the opposite side of the bag tube and seal the end closing fold thus made.

The tubular bag length with its bottom end once folded to form the tubular bag B is then forwarded to a second adhesive-applying station to receive a stripe of adhesive 12 applied across the external wall of the bag side in the area to be covered by the second bottom end fold when made, as shown in Figs. 4 and 8.

The bag B is then presented to a second bottom end fold forming means and the once folded bottom end bb thereof again folded so that the infolded face of the second bottom fold 13 is brought into contact with the externally applied transverse stripe of adhesive 12 and secured thereby to the wall of the bag. Alternatively, the externally applied fold-securing adhesive stripe 12 may be applied before the first formed bottom end fold 11 is made, as shown in Fig. 10.

Again alternatively, as shown in Fig. 13, the trans verse stripe of adhesive 12 for securing and sealing the second bottom end fold 13 can be applied to the external face of the first formed bottom end fold 11 prior to the formation of the second bottom end fold. If so desired, adhesive stripes 12; may be applied to the external faces of both the first formed bottom end fold 11 and the external wall of the bag tube so as to meet face to face when the second bottom end fold 13 is made.

The above described bottom end closing fold forming procedure may be limited to the formation of the aforesaid first bottom end fold 11, in which case the step of applying the external transverse stripe of adhesive 12 to the bag tube or bag need not be taken. In this case, as shown in Figs. 11 and 12, it is at present preferred to fold the open bottom of the severed bag tube length 7 about a transverse fold line 14 forwardly inset beyond both of the transverse stripes of adhesive 3 and 3a so that both adhesive stripes are carried over with thebottomend mush h ar n 1 1 i brqash iitg st w h t has: Wa s r a'fdly qtt st re a n to e adhe iv str v 3 ther 2 wer the stea s b m ad, t 14:. the wal b he. has. tu and; s t sswn or dou e s a wh sh. a sists in. rend rin the a; has a tom ppwderproof.

i Qmi s mi of. he asset q d tea qtz rati n from the above described procedure is all that is necessary to produce plain or flat tubular bags with single or double fold bottoms by the method of the present invention.

It it is desired to produce bags with straight lip mouths, the aforesaid notches 5 will be disposed entirely to one side of each transverse severing line 6 of the web so that in each case the entire notch lies in the fold area of the bottom end of the bag length severed from the bag tube.

The method of this invention may also be applied with advantage to the manufacture of powderproof bags from pre-cut individual blanks which are first folded longitudinally into either a plain or gusset folded form of bag tube and the bottom end thereof transversely folded to form a closed and sealed bottom of the bag.

We claim:

1. A method of producing a tubular bag with a folded bottom end, including the steps of applying at least one longitudinal seaming stripe of adhesive to at least one of the longitudinal margins of a bag blank, applying adhesive transversely across that surface of the said bag blank which will constitute the bottom end fold area of the internal walls of a bag tube formed from the said bag blank, cutting away a porton of each of the said longitudinal margins of the said bag blank to leave marginal openings in the said bottom end fold area thereof, the transversely applied adhesive and openings being'relatively positioned to expose a portion of the adhesive transversely through the openings, folding the said longitudinal margins of the said bag blank inwards over the longitudinal centre part thereof so that said longitudinal margins overlap and are secured together by said seaming stripe of adhesive to form said bag blank into a bag tube, and said marginal openings combine to form a slot-like opening in the said bottom end fold area of one side of the bag tube, and so that the internal walls of the formed bag tube are united and sealed by the transverse adhesive in the said bottom end fold area and across the entire width thereof folding the bottom end of said bag tube along a transverse fold line so as to secure the said transverse bottom end fold to a wall of the said bag tube by means of the adhesive exposed through the said opening in the bag tube side and thereby sealing the said bottom end fold so formed to close the bottom end of the said bag tube.

2. The method claimed in claim 1, including the step of applying adhesive to the inner surface of the said bag blank in at least two stripes extending transversely of the blank so that at least one of the said adhesive stripes lies between opposed inner walls of the sides of the said bag tube whilst at least one other of the said transversely extending stripes of adhesive is in part exposed through the said opening formed in the said bottom end fold area of one side of the said bag tube.

3. The method claimed in claim 1, including the step of applying a wide patch of adhesive to the said bag blank transversely thereof so that one part of the said patch lies between opposed inner walls of the sides of the said bag tube, whilst the other part of said adhesive patch is exposed through the said opening formed in the said bottom end fold area of one side of the said bag tube.

4. The method claimed in claim 1, including the step of disposing the said transversely applied adhesive which unites the inner opposed walls of the said bag tube so that one part of the said adhesive is contained in the area of that bottom end part of the said bag tube which is folded over to close and seal the bottom end of the said 2 4 Hi and h dh i a t re Whish emitt 6 has t bs and he the pa t of the said transrer eb ar sd ad esiv s ma ss t e. q tqm an f ldare at: he a d h s abs; hi h severe b he. id fqlsle ete aa t th said has ime T e. gnthvd s ams-s s aim ins min he step in he s i ttansys sslv p d. ad esiv hich unites the inner opposed walls of the said bag tube. so that the whole of the said adhesive is contained in the r f tha ottom end part ofthe said bag tube which is folded over close and seal the bottom end of the aid a e.

6. A method of producing a tubular gusset folded satchel bag with a folded bottom end, including the steps of applying at least one longitudinal seaming stripe of adhesive to at least one of the longitudinal margins of a bag blank, applying adhesive transversely across the surface of the said bag blank which will constitute the bottom end fold area of the internal walls of a bag tube formed from the said bag blank, cutting away a portion of each of the said longitudinal margins of the said bag blank to leave marginal openings in the said bottom end fold area thereof, tucking in the said longitudinal margins of the said bag blank to form the first longitudinal gusset folds therein, folding the said margins inwards over the longitudinal centre part of the said blank so that the second gusset folds are formed and the said margins overlap and are secured together by the said seaming stripe of adhesive to form the said bag blank into a gusset folded bag tube, and said marginal openings combine to form a slot-like opening in the said bottom end fold area of one side of the said bag tube, said transversely applied adhesive extending across the said web for a distance at least equal to the entire width of the formed flat folded bag tube plus the depth of each gusset fold formed therein, so that the opposed internal walls of the formed bag tube and said gusset folds are united and sealed by the adhesive in the said bottom end fold area and across the entire width thereof, while some part of the transversely applied adhesive is exposed through the said opening formed in the bag tube side, and folding the bottom end of the said bag tube along a transverse fold line so as to secure the said transverse bottom end fold to a wall of the said bag tube by means of the adhesive exposed through the said opening in the bag tube side and thereby sealing the said bottom end fold so formed to close the bottom end of the said bag'tube.

7. The method claimed in claim 6, including the step of applying adhesive to the inner surface of the said bag blank in at least two stripes extending transversely of the blank so that at least one of the said adhesive stripes lies between opposed inner walls of the sides of the said bag tube, whilst at least one other of the said transversely extending adhesive stripes is in part exposed through the said opening formed in the said bottom end fold area of one side of the said bag tube.

8. The method claimed in claim 6, including the step of disposing the said transversely applied adhesive which unites the inner opposed walls of the said bag tube so that one part of the said adhesive is contained in the area of that bottom end part of said bag tube which is folded over to close and seal the bottom end of the said bag tube, and the other part of the said transversely applied adhesive is contained in the bottom end fold area of the said bag tube which is covered by the said folded over part of the said bag tube.

9. The method claimed in claim 6, including the step of disposing the said transversely applied adhesive which unites the inner opposed walls of the said bag tube so that the whole of the said adhesive is contained in the area of that bottom end part of the said bag tube which is folded over to close and seal the bottom end of the said bag tube.

10. The method as claimed in claim 1, including the step of applying the adhesive which is exposed through the said opening formed by the said cut away portions of the said bag blank so that the said adhesive is contained in the area of that bottom end part of the said bag tube whichis folded over to close and seal the said bottom end of the said bag tube and so that fl1e said adhesive so exposed acts to secure the inturned face of the bottom end fold to an external wall of the said bag tube.

1,027,168 Bartlett May 21, 1912 8 Collings et a1. Jan. 15, Royal Jan. 22, Shea Aug. 27, Sargent et a1. Sept. 15, Potdevin Nov. 17, Haskell Nov. 24, Munson Apr. 19, Kimple Oct. 21, 

